LG 32LN549E (CHASSIS:LA3AA) Service Manual ▷ View online
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TROUBLE SHOOTING
1. Power-up boot check
Check stand-by Voltage.
P401 3, 5pin : +3.5V_ST
Check 18pin Power connector
M ain B/D 3.5V Line
Short Check
Check X201 clock
24 M Hz
Replace X201
Check P401 PWR_ON.
1pin : 3.3V
Replace M star(IC101) or M ain board
Check M ulti Voltage
P401 9, 10pin : 24V
/ 13, 14, 15pin:12V
Replace Power Board
Check DRV ON Control
P401 2 pin : High
Check Power Board
Check IC402/3/7 Output Voltage
IC402 : 2.5V
IC403 : 1.15V
IC404 : 1.5V
Q408 : 3.3V
Replace IC402, IC403, IC404, Q408
Re-download software.
Check stand-by Voltage
L402, L403 : +3.5V
Replace L402, L403
Check LVDS Power Voltage
Q406 : 12V
Replace Q406
Check M star LVDS Output
Replace M star(IC101) or M ain Board
Change M odule
ok
ok
ok
ok
ok
ok
ok
ok
ok
No
No
ok
Replace Power board.
ok
No
No
No
No
No
No
No
No
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2. Digital/Analog TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L1003
Replace L1003
Check Tuner 1.8V Power
IC1001 2 pin : 1.8V
Check IF_P/N Signal
TU1002 10/11 Pin
Replace IC1001
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
3. AV Video
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK701, CVBS Signal Line
R246
ok
ok
ok
No
Replace Jack
ok
Check CVBS_DET Signal
R705
Replace R705
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
No
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4. RGB Video
Check input signal format.
Is it supported?
Check RGB Cable
for damage or open conductor.
Check JK705
R/G/B signal Line
ok
ok
ok
No
Replace Jack
Check RGB_DET Signal
Replace R1732
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
No
5. HDMI Video
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
Check EDID Downlaod
ok
ok
ok
No
Replace the defective IC or re-download EDID data
Check HDMI Signal
Check other set
If no problem, check signal line
ok
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
No
Replace Main Board
No
Check HDMI_DET (HPD)
No
Replace HDMI1 R802, R805, Q801
HDMI2 R804, R805, Q802
HDMI3 R815, R817, Q804
Check HDMI I2C Signal
ok
No
Replace D801. D802
Check JK801, JK802,JK803
No
Replace Jack
ok
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6. All Source Audio
Check the TV Speaker Menu
(Menu -> Audio -> TV Speaker)
On
ok
ok
Replace C535, C537, C538, R516, R517
Check Connector & P501
Replace connector
if found to be damaged.
ok
No
Check speaker resistance
and connector damage.
Replace speaker.
ok
No
Off
Toggle the Menu
Check AMP IC(IC501) Power
24V, 3.3V
No
Replace Amp IC(IC501)
Check Output Signal P501
1, 2, 3, 4 pin.
No
Check Mstar AUDIO_MASTER_CLK
R148
No
Replace Mstar(IC101) or Main Board.
ok
Check AMP I2C Line
R503, R504
No
Check signal line. Or replace Mstar(IC101)
Replace Audio AMP IC(IC501)
Check signal line, L505, L506
ok
No
7. Digital/Analog TV Audio
Check RF Cable & Signal
Follow procedure
‘7. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L1003
Replace L1003
Check Tuner 1.8V Power
IC1001 2 pin : 1.8V
Check IF_P/N Signal
TU1002 6 Pin
Replace IC1001
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
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